AutoGen
is a tool designed to simplify the creation and maintenance of programs that
contain large amounts of repetitious text. It is especially valuable in programs
that have several blocks of text that must be kept synchronized.

GNU
DDD (Data Display Debugger) is a graphical front-end for command-line debuggers
such as GDB, DBX, WDB, Ladebug, JDB, XDB, the Perl debugger, or the Python
debugger. Besides ``usual'' front-end features such as viewing source texts,
DDD has become famous through its interactive graphical data display, where
data structures are displayed as graphs.

jikes
is the ultrafast Java compiler created by IBM.It translates Java source files
as defined in The Java Language Specification into the bytecoded instruction
set and binary format defined in The Java Virtual Machine Specification.

Practical
Extraction and Report Language, a language optimized for scanning arbitrary
text files, extracting information from those text files, and printing reports
based on that information. It's also a good language for many system management
tasks. The language is intended to be practical (easy to use, efficient,
complete) rather than beautiful (tiny, elegant, minimal).